Hydraulic jack



May 20, 1930.

' H. c. MILLER ET AL HYDRAULIC JACK Filed Aug. 23. 1928 HUIIIIIlv/flalP///// Patented May zo, 1930 ,HENRY CHIPMAN MILLER ANDy EDGAR HARRYDAIN'roN, or LoNDoN, RNGLARD l f HYDRAULIC JACK Appnation mea August 2a,1928,seri'a15N'o- 301,564, and insreat :Britain August so, 1927,

This invention relates to hydraulic'and kother fluid pressurerpjacksofthe kind in which ythe lower end ofthe ram cylinder is Yscrewed crotherwise secured to the basecasting and is housed *in the reservoir forthe oil or other motive Huid utilized for operating the jack. ff.' Y

The object of the.Y present invention Vis to simplify and 'improvetheconstruction of jacks ofy the kindreferred to so as to enable the baseand reservoir to be economically produced and to be rapidly andaccurately assembled and secured, thus effecting considerable economiesin manufacture. y

According to the present invention in a j acl of the kind referred tothe motive fluid reservoir is formed by assembling to the base casting aloose shell or casing which is arranged Vconcentrieally of the lixed ramcylinder and is clamped fluid .tightto the base casting by means of aperforated cover member that is adjustably coupledto the upper end ofthe lixed ram cylinder.

In a convenient construction the base casting is formed with concentricrecesses, the inner recess being tapped to receive the exterf nallythreaded lower end of the ram cylinder which is screwed therein, whilethe external concentric recess is furnished with packing and adapted toreceive the lower end .of the reservoir shell or casing. Y'

The upper end of the ram cylinder is also externally screw-threaded soas to engage with a counterpart screwthreaded perforated end-plate orwith a threaded nut or sleeve that carries the end-plate, lwhich,end-plate is adapted to form the cover of the reservoir and is groovedor recessed to receive the upper end of the shell or casing so that thelatter is firmly clamped to ythe base by screwing down the end-plate onthe ram cylinder or on the threaded sleeve or nut secured on the latter.Y Y

In the case of a jack having a simple ram, i. e. one with a single lift,the perforated endplate forming the cover may be provided vwith aninternally threaded socket which is adapted to screw on to the upper endof the ram cylinder and also to form the stuling box through which theram works, while inv the case of a ack provided with a telescopic ramhaving two or more lifts the internally threaded socket of theperforated end-plate UNITEDsTATss PATENT: oFFios;

is adapted to screw on to an externally threaded nut or sleeve whichforms theram stop and gland of the Vstuffing box through which the lowerlift of the telescopic ram works. 'f

Embodiments Vof the presentinvention are i' illustrated by way ofexample in theaccom- .panying drawings wherein'sirmlar references'indicate like parts.

"Figure l is a vertical section illustrating a hydraulic jack having asimple or single lift ram constructed in accordance with the present'invention; while c t Y Figure 2'is a similar viewY of a hydraulic j ackhaving a two-lifttelescopic ram.`

In the drawings v yl Vindicates the base casting of the jack, 2 theramcylinder, 3 the ram, 4 the shell or casing of the reservoir andf theadjustable perforated end-plate formingythe'cover of the reservoir. f f

A suitable force pump 20 and release valve 21'together with distributingand circulating passages indicated at 22 are mounted-and arranged in thebasel casting l forcirculating 'motive fluid between the reservoirandthe ram cylinder 2`to operate the ram 3 in known manner. f l

cylinder 2 is externally screw-threaded at its uppery end 2a and lowerend 2b, while concenlseating for the'machinefd lower edge fof, the

ramcylinder 2-When the latter is screwedfi'nto such recess. 1

The reservoir shelll or casing lisl securedl to thebase-icasti-ngl bymeans of the-perforated 80 In the constructions illustrated; the ram.tric recesses 6 and 7 are formed in the base end-plate which screwsover the upper end .of the ram cylinder 2 so as to form the cover lofthereservoir. The lower end of the shell or casing is adapted to make asliding lit with the outer concentric, recess 7 in the base casting 1,while its upper end makes asimilar fit with a counterpart groove orrecess 8 formed .in the adjacent surface of the end-plate 5.

As illustrated at Figure 1, the perforated endfplate Aris formed with aninternally threadedV lcentral socketr 10 ,which is adapted-4 Y receivean annular packing 13 together with a. gland'and'stop ringvlll, whichlatter seats against .the adjacent upper edge ofthe ram cylinder 2.1 Y

The reservoir shell or casing .bis clamped to the base casting 1 byscrewing down the end-plate 5 upon the threaded upper 'end' of theramcylinder 2, which Voperation simultaneously Y compresses theA rampacking V13 and leather or other packing 15 arranged Ain the recesses 7and 8 Yfor the upper and lower edges ofthe reservoir shell or casing 4:.In the modification illustrated at Figure 2 A the perforated end-plate 5is screwed Von to an externally screw-threaded'sleeve 16 which screws ontothe externally threaded upper v end2apof the ram cylinder2, and formslthe gland and stop ring for the lower lift or section of the telescopicram 3. Y

Y lIn this construction the internally threaded socket 10 screws on tothe externally screwthreaded sleeve 16 and Vis shouldered'down at ll'tovform the perforation throughV which f Y Y the lower lift or section ofthe telescopic ram The sleeve or nut 16 is also shouldered down asindicatedat 17 to form the gland and stop ringfor the lower lift orAsection ofsthe ram. Y

^ The reservoir' shell or casing 4c is clamped Y tothe base castings-1by screwing down the end-plate 5 onlthe sleeve 16,v which operationcompresses the ram Apacking -18 and also Vthe leather .or ctherpackingl5 at the upper and 1. A hydraulic or other iuid lpressure, jack Vhavinga fixed rain cylinder furnished with ,ank adj ustable' 1 externallysleeve adapted to form-a stop collar for the ram`working in saidcylinder, and a'reservvoir for the motive fluid formed by means with acentral perforated socket and a conv centric recess, said socket beingadapted td make threaded engagement with said exterl nally threadedsleeve and to form in combination therewith a gland and stufling'box forthe ram. Y

2.. A hydraulic Yor other fluid pres-sure jack, having a reservoir forthe motive fluid formed by means of a loose shell or casing assembled tothe base concentrically of a fixed ram cylinder and clamped liuidlln'i`gfl1t infposition by aV perforated cover plate formed withacentral perforated socket and a concentric'recess and comprising anouter annular member threaded'internally and an innerexternally and in`f vternally threaded stopring in engagement 4with the externallythreaded upper endV ,of

said ram cylinder, said socket being adapted to house anlannular",packing and Vto form, in

`combination therewith,aV gland and stuliingbox for the ram. f Y,

In testimony lwhereorf'we affix our sig-na-V f tures..

HENRYk VClflllMAN` MILLER. EDGAR HARRYk DA'INTON.

3 works, and also the recess for the 'annular i Apacking 13 for such ramsection.

{ lowerends of the reservoir shell or casing, as Y described withreference to Figure 1. We claim l e screwthreaded Y of a loose shellor'casing assembled to the s base concentrically ofy said* cylinder andclamped iny position by a cover plate formed iso

